While I was planning out the stand, I kept my eyes open for kegs to convert. The first 3 I found on craigslist.
First I laid out a circle, and cut the tops out.
[IMG]

[/IMG]
Then I planned out how many ports I would need, and where I would need them, and started drilling holes.
[IMG]

[/IMG]
I used a hole saw to drill the holes just a bit smaller then the OD of the 1/2" couplings, and then used an abrasive stone to make the holes just the right size. You want the couplings to fit just perfect, not to sloppy, ro welding them will be a pain.
[IMG]

[/IMG]